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SK Tephra Matsui and Inoue, 1971

Abbr.: SK

• Tephra
• Pleistocene (115 - 110 ka, FT)
• Correlation: Koshibara Tephra

• Lithofacies: Volcanic ash

• Host: Middle Terrace Deposit (Suzu), Middle II Marine Terrace Deposits (Fukui), Middle Terrace Deposits (Tsuruga), Sashimi Formation, Yasugi Formation
• Thickness: ca. 15 - 40 cm
• Lower limit: Unconformity (Higher I Terrace Deposits, Middle II Terrace Deposits, Older Fan Deposits, Noro Basalt)

• Distribution: Anden seashore, Oga city, Akita pref.; Hiratoko, Shoin town, Suzu city, Ishikawa pref.; Mizukiri town, Fukui city, Fukui pref.; Mount Otsukayama, Daikonjima island, Yatsuka town, Matsue city, Shimane pref.; Hebinokawa river, Daisen city, Saihaku county, Tottori pref.

• Kano et al. (2025) Geology of the Yonago District (2nd Ed.), Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 84p. (in Japanese with English abstract 4p.)
• Nakae et al. (2013) Geology of the Imajo and Takenami District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 110p. (in Japanese with English abstract 4p.)
• Kano et al. (2007) Geology of the Fukui District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 68p.
• Kano and Yoshida (1985) Geology of the Sakaiminato District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)